Federer loses again, may be out as No. 1 (AP)

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Roger Federer lost another match and, perhaps, his longtime grip on No. 1, as well. The world's top-ranked player had another out-of-character setback on Thursday, a three-set loss to Ivo Karlovic that left the Croat exulting on his back and opened the way for Rafael Nadal to take over the No. 1 spot by winning the Cincinnati Masters championship.



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